ImagickDraw::circle

(PECL imagick 2.0.0)

ImagickDraw::circle — Draws a circle

Описание

bool ImagickDraw::circle ( float $ox , float $oy , float $px , float $py )

Внимание

К настоящему времени эта функция еще не была документирована; для ознакомления доступен только список аргументов.

Draws a circle on the image.

Список параметров

ox: origin x coordinate
oy: origin y coordinate
px: perimeter x coordinate
py: perimeter y coordinate

Возвращаемые значения

Эта функция не возвращает значения после выполнения.

Коментарии

Jun 23

Автор: christian dot reinecke at web dot de


This example creates a circle, one part green, one part red using kind of masks for transparency, which you might know from Photoshop. drawImage() is a quick helper for debug output (see code comments) to help you reproduce the process.



<?php

function drawImage(Imagick $im) {

    $im->setCompressionQuality(100);

    $im->setImageFormat("jpg");

    header("Content-Type: image/" . $im->getImageFormat());

    echo $im;

    exit;

}



// define red/green layer

$layer1 = new Imagick();

$layer1->newImage(100, 100, "none");



$red = new ImagickDraw();

$red->setFillColor("#FF0000");

$red->rectangle(0, 0, 50, 100);



$green = new ImagickDraw();

$green->setFillColor("#00FF00");

$green->rectangle(50, 0, 100, 100);



$layer1->drawImage($red);

$layer1->drawImage($green);



# debug output: two rectangles

# drawImage($layer1);



// define circle mask

$layer2 = new Imagick();

$layer2->newImage(100, 100, "none");



$circle = new ImagickDraw();

$circle->setFillColor("#FFFFFF");

$circle->circle(50, 50, 48, 98);



$layer2->drawImage($circle);



# debug output: the mask

# drawImage($layer2);



// use mask

$layer1->compositeImage($layer2, Imagick::COMPOSITE_DSTIN, 0, 0);



# debug output: the result of our mask usage

# drawImage($layer1);



// define background

$layer3 = new Imagick();

$layer3->newImage(100, 100, "none");



$layer3->compositeImage($layer1, Imagick::COMPOSITE_DEFAULT, 0, 0);



// define ring as background

$layer4 = new Imagick();

$layer4->newImage(100, 100, "white"); // this is our background



$ring1 = new ImagickDraw();

$ring1->setFillColor("black");

$ring1->circle(50, 50, 50, 99);



$layer4->drawImage($ring1);



# debug output: this is a black circle (not our mask, which is similar, but a little bit smaller)

# drawImage($layer4);



// use black circle as background (this creates our circle border)

$layer4->compositeImage($layer3, Imagick::COMPOSITE_DEFAULT, 0, 0);



# debug output: here we go with our circle border

# drawImage($layer4);



// draw separator between red and green rectangle (now semi circles)

$line = new ImagickDraw();

$line->setStrokeWidth(1);

$line->setStrokeColor("black");

$line->line(50, 1, 50, 99);



// add our separator line

$layer4->drawImage($line);



drawImage($layer4);

?>



To understand how the COMPOSITE_* constants effect the image merging process, see here:

http://www.imagemagick.org/Usage/compose/#duff-porter

2009-06-23 16:31:47

http://php5.kiev.ua/manual/ru/function.imagickdraw-circle.html

Feb 24

Автор: garym at binaryfarm dot com


<?php

// OR we could just draw a simple circle for the benefit of the newbies.

// I'm not great at OOP programming and I hope my comments are accurate.

// commets or criticism are welcome.



$image = new Imagick();    // Create a new instance an $image class



$width =  600;        // Some necessary dimensions

$height = 400; 



// $image class now inherits some attributes. i.e. Dimensions, bkgcolor...

$image->newImage( $width, $height, new ImagickPixel( 'lightgray' ) );



$draw = new ImagickDraw();    //Create a new drawing class (?)



$draw->setFillColor('wheat');    // Set up some colors to use for fill and outline

$draw->setStrokeColor( new ImagickPixel( 'green' ) );



$draw->circle( $width/2, $height/2, $width/2, $width/2 );    // Draw the circle already 



$image->drawImage( $draw );    // Apply the stuff from the draw class to the image canvas



$image->setImageFormat('jpg');    // Give the image a format



header('Content-type: image/jpeg');     // Prepare the web browser to display an image

echo $image;                // Publish it to the world!



//$image->writeImage('someimage.jpg");    // ...Or just write it to a file...



?>